Sin material node casts input to Float1 if const

Development Rendering
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1

If a Sine material graph node is attached to a uniform value (so it is constant and it can put in a preshader), the output is a float1, and not a float sized as the input.

Probably caused by FHLSLMaterialTranslator::Sine.

2

Hello,

Thank you for reaching out.

I’ve been assigned this issue, and we will be looking into the behavior of MaterialExpressionSine for you.

3

Hello,

Thank you for your patience.

We are discussing this issue with our colleagues and will get back to you.

4

Hello,

The behavior of Sine Material Expression casting to float1 is intended behavior.

You can always use a Sine Material Expression per-channel, or use a Custom Material Expression to call sine() on a floatN constant.

Please let us know if this helps.

5

Sure. Thanks.

6

So, it should always cast to float1. sin(0.0,time) returns float2(sin(0),sin(time))

7

Hello,

The Sine Material Expression casts to a float1 when the input is a constant (uniform expression), and does not otherwise.

For more information, please see the definition in “FHLSLMaterialTranslator::Sine(…)” from HLSLMaterialTranslator.cpp, particularly, that the “CoerceParameter(…)” (cast) call is only made in the input is a Uniform Expression.

Please let us know if this helps.

8

Yes, I know. It seems a bit odd. Thanks.

9

Hello,

Thank you for the reply.

Can we close your case? You can always re-open it if you have additional questions about the same issue.